For detailed description of the above formulae derivation, we refer the reader to refs. [1]}, [2]}, [3]}. In this paper, to get \(\Delta d_{L}^{(0)} / d_{L}^{(0)}\) , we consider the dipole anisotropy of luminosity distance from the GW standard sirens produced by the BNS and observed by the DECIGO detector. The systematic error of the averaged luminosity distance is [3]}
\(\left[\frac{\Delta d_{L}^{(0)}(z)}{d_{L}^{(0)}(z)}\right]^{2}=\sigma _{\text{inst }}^{2}(z)+\sigma _{\text{lens }}^{2}(z)+\sigma _{\mathrm {pv}}^{2}(z),\) 
